System of circulating lubrication for internal-combustion motors.



. P. DAIMLER.

SYSTEM 0F CIRCULATING LUBRICATION FOR INTERNAL COMBUSTION MOTORS.

' APPLICATION FILED MAR. 26, I915.

3.,1 9 3515 Pateritedfsept. 26,1916

PATENT PAUL DAIMLER, OF CANNSTATT, A-SSIGNOR T0 DAIMLER-MOTQREN-GESELLSCHAFQ OF UNTERTURKHEIM, GERMANY, A FIRM.

SYSTEM OF CIRCULATING LUBRICATION FOR INTERNAL-COMBUSTION MG'ZORS.

Specification of Letters Patent.

Patented Sept. $6, 39MB.

Application filed March 26, 1915. Serial No. 127,270.

To all whom itm oi) concern Be it known that I, PAUL DAIMLER, subject ofthe King of Wurttemberg, residing at 87 W aib'lingerstrasse, Cannstatt,in the Kingdom of VVur-ttemberg, German Empire, have invented certainnew and useful Im provements in Systems of Circulating Lubrication forInternal-Combustion Motors, of which the following is a specification.

The present invention relates to the lubrication of the valve tionengines.

In engines ofthis kind it is old to employ a hollow cam shaft, to drivethe lubricant under pressure through said shaft and to gear ofinternalcombuscause it to escape throughradial channels provided in saidshaft close to the cam shaft hearings and to the surfaces of the cams,

iiccording to the present invention the circulating lubrication systemdescribed is improved by combining it with an outside lubrication of thecams and bearings, the said lubrication from outside forming part of thecirculation system so as to secure a permanent regeneration of the oileffecting the outside lubrication. To this end the oil in excess flowingofi the bearings and cams lubricated from inside the shaft is stopped upwithin the tube shaped casing surrounding the cam shaft by providingwithin said casing an overflow adapted to keep'the oil in the casing ata certain level,

- the oil in excess flowing back to the oil tank.

In order to allow the oil from all parts of the .cam shaft casing to Howback to the tank the shaft bearings dividing said easing into a numberof separate chambers are provided with channels connecting saidchambers, and the last .bearing located at the front end of the eatingaway from the oil inlet is further prov'itled with peripheral groovescommunieating with the connecting channel and conducting the oil inexcess back to the oil tank.

In a lubricating system of this kind a single oil feed tube only isprovided for the cam shaft bearings, whereas the oil in excess flowing0d the bearings is employed for the auxiliary lubrication from outside'This causes the oil pressure to remain constant and always the samequantity of oil to be fed to the parts to be lubricated and to the camshaft casing in general. Thus all parts are uniformly fed with lubricantof equal qualities.

The new system is especially advantageous for use with aeroplane motorswhere safe working of the engine under varying conditions is decisive.

The drawings aflixed to this specification show the preferred form of alubricating system according to the present invention.

In the drawings Figure-l is an elevation of an upright arranged abovethe cylinders, said motor being adapted to be used as well in anautomobile a on an aeroplane.

drawn to a bigger scale.

The crank shaft a of the motor carries a bevel gear wheel 7) gearingwith another bevel gear wheel 0 on the vertical shaft ii. A bevel gearwheel c fixed on the other end of the vertical shaft is in gear with abevel gear wheel f on the cam shaft 9. The crank shaft a further drivesan oil pump it by means of bevel gear wheels k and worm gear I. The oilpump presses the oil from the oil tank through tubing m into the hollowcam shaft 9 carried within a casing p by bearings .0. The pressurecreated by the oil pump together with the centrifugal ac surfaces and tothe valve gear. As the cir culation system described effects alubrication in excess, the oil in excess must be carried back to the oiltank through the casing 72. Channels are provided to this end in thebearings, said channels connecting the chambers formed between thebearings with each other and the channel in the. bearing near thevertical shaft d forms a connection between the casing andithe interiorof said shaft, the return of the oil to the tank being thereby assured.

A funnel t is inserted between the casing p and the hollow shaft d.Instead of using the vertical shaft for the oil returna special tubingmay be provided.

In order to combine the circulation lubrication proper from inside thecam shaftwith an outside lubrication by simple immersion of the parts tobe lubricated, the outer bearing 0 of the cam shaft next to the verticaldriving shaft d is provided with channels to (Fig. 2) placed at asuitable level 'Fig. '2 is a cross section of the cam shaft'and casingmotor having the cam shaft stantly immersed in oil. A semi-peripheralgroove o serves as a communication between the cross-channels u and thevertical shaft J.

I claim 1. In a system of circulating lubrication for internalcombustion motors, in combination, a hollow cam shaft having radialchannels adapted to connect the interior of saidshaft with itsouter'surfacefa casing surrounding said shaft, means for pressing oilinto said shaft at one end and means for keeping the oil escapingthrough said channels into said casing at such a level, that said shaftdips into the oilcontained in said casing.

2. In a system of circulating lubrication internal combustion motors,the combination of a hollow cam shaft having radial channels leadingfrom its interior to its outer 'oil admission having a substantiallyhorizontal channel at a level above the lowest points of the cams.

4. In a circulating lubrication system for internal combustion motors.the combination of a hollow cam shaft having radial channels extendingfrom its interior to its outer surface, a casing surrounding said shaft,

bearings for said shaft within the casing-- and means for forcing oilinto said shaft" from one end, the bearing most remote from the oiladmission having a substantially horizontal channel extending at a levelabove the lowest points of the cams and the intermediate bearingshavingv horizontal, over flow channels.

In testimony whereof'I afiix my signature in presence of two witnesses.I

, PAUL DAIMLER. Witnesses:

ROBERT UHLAM, EUGENE SCHLENKER.

